[BRLTTY] Handling data flow diagrams and system flow charts

[Daniel Dalton]

Hi all, 

I'm completing a university subject this semester which relies on the
reading and drawing of data flow diagrams and system flow charts. 

Has anyone got any recommendations how to do this somehow under Linux?
Trying to avoid tactile diagrams, but obviously that is a good fallback
option. Apparently under windows this can be accomplished by using
Microsoft Project, so I'm interested to hear whether anyone can share
some advice on how to best read and draw these types of charts?

Thanks in advance. 

Cheers, 
Dan